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本文作者：小竹zz 本文地址 转载请注明出处
本文介绍
TcpListener 类提供一些简单方法，用于在阻止同步模式下侦听和接受传入连接请求。 可使用 TcpClient 或 Socket 来连接 TcpListener。 可使用 IPEndPoint、本地 IP 地址及端口号或者仅使用端口号，来创建 TcpListener。 可以将本地 IP 地址指定为 Any，将本地端口号指定为 0（如果希望基础服务提供程序为您分配这些值）。 如果您选择这样做，可在连接套接字后使用 LocalEndpoint 属性来标识已指定的信息。使用 Start 方法，可开始侦听传入的连接请求。 Start 将对传入连接进行排队，，直至您调用 Stop 方法或它已经完成 MaxConnections 排队为止。 可使用 AcceptSocket 或 AcceptTcpClient 从传入连接请求队列提取连接。 这两种方法将阻止。 如果要避免阻止，可首先使用 Pending 方法来确定队列中是否有可用的连接请求。
虽然TcpListener已经封装的比较不错了，我们于是就使用它在构造一个比较不错的异步TCP服务器，这里依然和前两章一样，给出服务器中的代码，代码中注释很详细，我也会给出相关的封装类。
TcpListener异步TCP服务器
服务器代码
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Net.Sockets;using System.Net;namespace NetFrame.Net.TCP.Listener.Asynchronous{/// <summary>/// TcpListener实现异步TCP服务器/// </summary>public class AsyncTCPServer : IDisposable{#region Fields/// <summary>/// 服务器程序允许的最大客户端连接数/// </summary>private int _maxClient;/// <summary>/// 当前的连接的客户端数/// </summary>private int _clientCount;/// <summary>/// 服务器使用的异步TcpListener/// </summary>private TcpListener _listener;/// <summary>/// 客户端会话列表/// </summary>private List<Object> _clients;private bool disposed = false;#endregion#region Properties/// <summary>/// 服务器是否正在运行/// </summary>public bool IsRunning { get; private set; }/// <summary>/// 监听的IP地址/// </summary>public IPAddress Address { get; private set; }/// <summary>/// 监听的端口/// </summary>public int Port { get; private set; }/// <summary>/// 通信使用的编码/// </summary>public Encoding Encoding { get; set; }#endregion#region 构造函数/// <summary>/// 异步TCP服务器/// </summary>/// <param name="listenPort">监听的端口</param>public AsyncTCPServer(int listenPort): this(IPAddress.Any, listenPort){}/// <summary>/// 异步TCP服务器/// </summary>/// <param name="localEP">监听的终结点</param>public AsyncTCPServer(IPEndPoint localEP): this(localEP.Address, localEP.Port){}/// <summary>/// 异步TCP服务器/// </summary>/// <param name="localIPAddress">监听的IP地址</param>/// <param name="listenPort">监听的端口</param>public AsyncTCPServer(IPAddress localIPAddress, int listenPort){Address = localIPAddress;Port = listenPort;this.Encoding = Encoding.Default;_clients = new List<Object>();_listener = new TcpListener(Address, Port);_listener.AllowNatTraversal(true);}#endregion#region Method/// <summary>/// 启动服务器/// </summary>public void Start(){if (!IsRunning){IsRunning = true;_listener.Start();_listener.BeginAcceptTcpClient(new AsyncCallback(HandleTcpClientAccepted), _listener);}}/// <summary>/// 启动服务器/// </summary>/// <param name="backlog">/// 服务器所允许的挂起连接序列的最大长度/// </param>public void Start(int backlog){if (!IsRunning){IsRunning = true;_listener.Start(backlog);_listener.BeginAcceptTcpClient(new AsyncCallback(HandleTcpClientAccepted), _listener);}}/// <summary>/// 停止服务器/// </summary>public void Stop(){if (IsRunning){IsRunning = false;_listener.Stop();lock (_clients){//关闭所有客户端连接CloseAllClient();}}}/// <summary>/// 处理客户端连接的函数/// </summary>/// <param name="ar"></param>private void HandleTcpClientAccepted(IAsyncResult ar){if (IsRunning){//TcpListener tcpListener = (TcpListener)ar.AsyncState;TcpClient client = _listener.EndAcceptTcpClient(ar);byte[] buffer = new byte[client.ReceiveBufferSize];TCPClientState state= new TCPClientState(client, buffer);lock (_clients){_clients.Add(state);RaiseClientConnected(state);}NetworkStream stream = state.NetworkStream;//开始异步读取数据stream.BeginRead(state.Buffer, 0, state.Buffer.Length, HandleDataReceived, state);_listener.BeginAcceptTcpClient(new AsyncCallback(HandleTcpClientAccepted), ar.AsyncState);}}/// <summary>/// 数据接受回调函数/// </summary>/// <param name="ar"></param>private void HandleDataReceived(IAsyncResult ar){if (IsRunning){TCPClientState state = (TCPClientState)ar.AsyncState;NetworkStream stream = state.NetworkStream;int recv = 0;try{recv = stream.EndRead(ar);}catch{recv = 0;}if (recv == 0){// connection has been closedlock (_clients){_clients.Remove(state);//触发客户端连接断开事件RaiseClientDisconnected(state);return;}}// received byte and trigger event notificationbyte[] buff = new byte[recv];Buffer.BlockCopy(state.Buffer, 0, buff, 0, recv);//触发数据收到事件RaiseDataReceived(state);// continue listening for tcp datagram packetsstream.BeginRead(state.Buffer, 0, state.Buffer.Length, HandleDataReceived, state);}}/// <summary>/// 发送数据/// </summary>/// <param name="state">接收数据的客户端会话</param>/// <param name="data">数据报文</param>public void Send(TCPClientState state, byte[] data){RaisePrepareSend(state);Send(state.TcpClient, data);}/// <summary>/// 异步发送数据至指定的客户端/// </summary>/// <param name="client">客户端</param>/// <param name="data">报文</param>public void Send(TcpClient client, byte[] data){if (!IsRunning)throw new InvalidProgramException("This TCP Scoket server has not been started.");if (client == null)throw new ArgumentNullException("client");if (data == null)throw new ArgumentNullException("data");client.GetStream().BeginWrite(data, 0, data.Length, SendDataEnd, client);}/// <summary>/// 发送数据完成处理函数/// </summary>/// <param name="ar">目标客户端Socket</param>private void SendDataEnd(IAsyncResult ar){((TcpClient)ar.AsyncState).GetStream().EndWrite(ar);RaiseCompletedSend(null);}#endregion#region 事件/// <summary>/// 与客户端的连接已建立事件/// </summary>public event EventHandler<AsyncEventArgs> ClientConnected;/// <summary>/// 与客户端的连接已断开事件/// </summary>public event EventHandler<AsyncEventArgs> ClientDisconnected;/// <summary>/// 触发客户端连接事件/// </summary>/// <param name="state"></param>private void RaiseClientConnected(TCPClientState state){if (ClientConnected != null){ClientConnected(this, new AsyncEventArgs(state));}}/// <summary>/// 触发客户端连接断开事件/// </summary>/// <param name="client"></param>private void RaiseClientDisconnected(TCPClientState state){if (ClientDisconnected != null){ClientDisconnected(this, new AsyncEventArgs("连接断开"));}}/// <summary>/// 接收到数据事件/// </summary>public event EventHandler<AsyncEventArgs> DataReceived;private void RaiseDataReceived(TCPClientState state){if (DataReceived != null){DataReceived(this, new AsyncEventArgs(state));}}/// <summary>/// 发送数据前的事件/// </summary>public event EventHandler<AsyncEventArgs> PrepareSend;/// <summary>/// 触发发送数据前的事件/// </summary>/// <param name="state"></param>private void RaisePrepareSend(TCPClientState state){if (PrepareSend != null){PrepareSend(this, new AsyncEventArgs(state));}}/// <summary>/// 数据发送完毕事件/// </summary>public event EventHandler<AsyncEventArgs> CompletedSend;/// <summary>/// 触发数据发送完毕的事件/// </summary>/// <param name="state"></param>private void RaiseCompletedSend(TCPClientState state){if (CompletedSend != null){CompletedSend(this, new AsyncEventArgs(state));}}/// <summary>/// 网络错误事件/// </summary>public event EventHandler<AsyncEventArgs> NetError;/// <summary>/// 触发网络错误事件/// </summary>/// <param name="state"></param>private void RaiseNetError(TCPClientState state){if (NetError != null){NetError(this, new AsyncEventArgs(state));}}/// <summary>/// 异常事件/// </summary>public event EventHandler<AsyncEventArgs> OtherException;/// <summary>/// 触发异常事件/// </summary>/// <param name="state"></param>private void RaiseOtherException(TCPClientState state, string descrip){if (OtherException != null){OtherException(this, new AsyncEventArgs(descrip, state));}}private void RaiseOtherException(TCPClientState state){RaiseOtherException(state, "");}#endregion#region Close/// <summary>/// 关闭一个与客户端之间的会话/// </summary>/// <param name="state">需要关闭的客户端会话对象</param>public void Close(TCPClientState state){if (state != null){state.Close();_clients.Remove(state);_clientCount–;//TODO 触发关闭事件}}/// <summary>/// 关闭所有的客户端会话,与所有的客户端连接会断开/// </summary>public void CloseAllClient(){foreach (TCPClientState client in _clients){Close(client);}_clientCount = 0;_clients.Clear();}#endregion#region 释放/// <summary>/// Performs application-defined tasks associated with freeing,/// releasing, or resetting unmanaged resources./// </summary>public void Dispose(){Dispose(true);GC.SuppressFinalize(this);}/// <summary>/// Releases unmanaged and – optionally – managed resources/// </summary>/// <param name="disposing"><c>true</c> to release/// both managed and unmanaged resources; <c>false</c>/// to release only unmanaged resources.</param>protected virtual void Dispose(bool disposing){if (!this.disposed){if (disposing){try{Stop();if (_listener != null){_listener = null;}}catch (SocketException){//TODORaiseOtherException(null);}}disposed = true;}}#endregion}}客户端处理封装类
当你能梦的时候就不要放弃梦
